Coaxial aspheric surface four-reflecting mirror optical system with long focal length short structure

A technology of optical system and flat mirror, which is applied in the field of space optics, can solve problems such as no discovery, achieve convenient processing and adjustment, reduce the number of degrees of freedom in assembly and adjustment, and reduce the difficulty of processing and detection

Active Publication Date: 2013-03-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Coaxial aspheric surface four-reflecting mirror optical system with long focal length short structure
  • Coaxial aspheric surface four-reflecting mirror optical system with long focal length short structure

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Embodiment Construction

[0028] The invention according to figure 1 The structure shown is implemented. The focal length of the image side is 2466mm, the relative aperture D / F is 1 / 13.7, the field of view deviation angle is 7.0°~7.3°, the vertex curvature radius R1=-1902.171mm of the reflective surface of the primary mirror 1, and the vertex curvature of the reflective surface of the secondary mirror 2 Radius R2=-1277.557mm, radius of curvature R3=-1492.532mm for the vertex of the reflective surface of the three mirrors 4, R4=1237.540mm for the vertex of the reflective surface of the four mirrors 5; the distance between the primary mirror 1 and the secondary mirror 2 d1=-418.645mm , the distance d2=420.000mm from the secondary mirror 2 to the third mirror 4, d3=-415.000mm from the third mirror 4 to the fourth mirror 5; for the folding rear focal length, a flat mirror 6 is introduced behind the fourth mirror 5, and the fourth mirror 5 The distance to the plane mirror 6 is d4=750.000mm, the off-axis an...

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Abstract

The invention relates to a coaxial aspheric surface four-reflecting mirror optical system with a long focal length short structure, and belongs to the optical system in the technical field of space optics. The invention aims at providing the coaxial aspheric surface four-reflecting mirror optical system with the long focal length short structure. The technical scheme is as follows: the coaxial aspheric surface four-reflecting mirror optical system comprises a primary mirror, a secondary mirror, a diaphragm, a third mirror, a fourth mirror, a planar reflecting mirror and a detector image surface, wherein the primary mirror and the secondary mirror are double-curved surface mirrors, and the third mirror and the fourth mirror are high-order aspheric surface mirrors. The primary mirror, the secondary mirror, the third mirror and the fourth mirror are coaxial, the secondary mirror is placed on a reflection light path of the primary mirror, the third mirror is placed on the reflection light path of the secondary mirror, the fourth mirror is placed on the reflection light path of the third mirror, the planar reflecting mirror is placed on the reflection light path of the fourth mirror, and the off-axis angle of the planar reflecting mirror against the detector image surface is minus 49 degrees. The aperture diaphragm is fixedly connected on a mirror frame of the secondary mirror, and the system adopts a field bias design. The system can get high pixel resolution and larger field of view and has compact structure and great application potential in the field of the space optics.

Description

technical field [0001] The invention belongs to the technical field of space optics and relates to an aspheric surface coaxial four-mirror optical system with long focal length and short structure. Background technique [0002] It can be seen from the basic theory that when the orbital height of the space camera and the pixel size of the CCD are constant, the pixel resolution on the ground can be improved with the increase of the focal length of the optical system. Usually, the optical system with a focal length of more than 1m is called a long focal length optical system. As the focal length of the traditional refractive optical system increases, the volume of the optical system will increase, resulting in an increase in the quality of the optical system, thereby increasing the launch cost. At the same time, it is difficult to correct the chromatic aberration of the refractive optical system. In contrast, the reflective optical system has no chromatic aberration, and the op...

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Application Information

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IPC IPC(8): G02B17/06
Inventor 刘伟奇刘军冯睿魏忠伦张大亮
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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